Pre-heat oven to 375°F (190°C).
In a large bowl, whisk eggs, milk, salt and pepper. Whisk in almonds and cheese. Set aside.
In a 10-inch (25-cm), oven proof, non-stick skillet, heat oil over medium-high heat. Add onion, salt, pepper, bacon and apples. Cook until softened, about 5 minutes.
Pour egg mixture into skillet with fillings.
Bake until set and golden, about 25 minutes.
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